Duplicator



Jan. 6, 1942.

H. HILDEBRANDT' DUPLICATOR Filed July 51, 1959 yay Patented Jan. 6, 1942UNF-FEI.)` STATES V PATENT OFFICE 2,269,199 'f c Y DUPLIoA'ToR"HenryHildebrandt, Chicago, Ill. Application July 31, 1939, serialNv.,2s7,547 3 Claims. (Chlor-111s) My invention relates to improvementsin duplicators and more particularly to an improvement in the feedingmechanism thereof, the present invention being lan improvement on thatdisclosed in the prior patent to Gerrmann No. 2,062,876, dated December1, 1936.

The primary object of the present invention is to provide a duplicatorso constructed andarranged that narrower sheets of paper than those forwhich the machine is primarily designed may be fed therethrough.

Other objects will appear hereinafter.

'I'he invention consists in the combinations and arrangements of partshereinafter described and` claimed.

The invention will be best understood by reference to the accompanyingdrawing forming a part hereof and in which:

Fig. 1 is a partial side view, shown partially in section, of aduplicator of well known construction to which my improvement has beenapplied;

Fig. 2 is a partial horizontal section thereof and Fig. 3 a detail viewshowing the operating parts in different positions from those shown inFigs. l and 2. i

The embodiment of the invention illustrated in the drawing comprises aframe I in which a stencil cylinder II is rotatably mounted, saidcylinder carrying the usual inked stencil in the usual manner. The usualimpression roller I2 has its trunnions I3 rotatably mounted in bearingsI4 on `operating arms I5 which are pivoted at I6 on the frame of theduplicator. The arms I are normally drawn upwardly by means of tensionsprings I'I to apply the impression roller to the stencil cylinder inthe usual way. Paper stops I8 carried by rocker arms I9 mounted onrocker shaft 20 serve in the usual way to stop and properly position thesheets of paper 2I fed to the machine in the usual way, there being oneof the stops I8 'at each side of the machine.

Suitable cam mechanism, not shown, is provided for periodicallydepressing the impression roller and operating the shaft 20 and thestops I8 'in timed relation with the cylinder I I as is usual induplicators of this character.

Each of the arms I5 is provided on its inner side with an adjustablestop 22 adjustably mounted as shown in a lug 23 on its inner side. Latchmembers 24 are pivoted as shown at 25 to hang normally in substantiallyvertical positions at each end of the cylinder II in the upward path ofthe stops 22 so that when in normalpositions the latches 24 will preventupward movement of theimpression roller I2 as will be readilyunderstood. Each latch 24 carriesat its top a projection 26 arranged inthe path of the corresponding edge of the paper sheet and immediatelyinfront of the corresponding stop I8 substantially at the vplanel ofcontact between the cylinder 'I I and roller I2 so that as each sheet isfed into' the machine against the stops I8, its sides will first contactwith the latch projections 26 and tilt saidlatches 24 out of thepaths-ofv thestops 22 thus permitting upward movement of the' roller I2when a paper sheet is in proper position between said cylinder androller against the stops .I 8. By this arrangement contact of theimpression roller with the stencil is prevented when no paper sheet isbetween the cylinl der and roller and whereby soiling of the impressionrollerby thestencil sheet is prevented. The parts already described, ortheir equivalents, are shown in the' said Patent No. 2,062,876, andconstitute no part of my present invention except insofark as theycooperate with the partsto be presently described. y 1 1 However aduplicator constructed'in accordance with rthe said Patent No;v2,062,876 is designed and .intended to use only sheets kof a standardwidth and Ifhave therefore added to such construction the parts to bepresently described which are constructed and rarranged to operate topermit the feeding of narrow sheets of paper through the duplicator forshort periods of time.

To this end I arrange release members 21 at each side of the machine andpivoted at 28 to the underside of the normal feed table thereof.

Each of these release members is provided with an upstanding operatinglip or thumb piece 29 projecting upwardly adjacent the correspondingtable edge in position to be readily manipulated by the operator. Eachrelease member 211s also provided with a downwardly and rearwardlyextending release arm 30 arranged as shown to contact with a stop lugy3| on the forward side of the corresponding latch member 24 so that whenthe thumb pieces 29 are swung inwardly the latches 24-are tilted intoinoperative positions as indicated in Fig. 3 and whereby either or bothof said latch members 24 may be selectively rendered inoperative orineffective as and when desired. 'The frictional resistance on therelease members 2'I is sufficient to hold said latch members ininoperative positions until the thumb pieces 29 are swung outwardly,whereupon said latch members will return to their normal operativesubstantially vertical positions over the stops 22 as will be readilyunderstood. By this arrangement when it is desired to feed sheets ofpaper through the machine of less than the normal width for which themachine is designed and intended one of the latch members 24 may be thusrendered inoperative so that the feeding of the sheets through themachine against the normal and usual sheet guide at the other sidethereof will operate the corresponding latch member 24 and thus renderthe use of narrower sheets possible. Obviously if la narrower sheet werefed through the machine While both of the latch members 24 were inoperative positions, one of said latch members would necessarily remainoperative, thus preventing normal elevation and operation of theimpression roller under such circumstances. But where one of the latchmembers 24 is thus rendered inoperative, narrow sheets of paper may befed through the machine provided they are so fed as to operate the otherlatch member as will be readily understood. Thus the machine may bereadily adjusted for use in conjunction with narrower sheets of paperwhenever desired. Of course where one of the latch members is thusrendered inoperative, the entire strain of stopping the velevation ofthe impression roller is thrown upon the other latch member and there isalso a tendency to tilt said roller, so that, if the feeding of narrowsheets is too long continued, there may. be some yielding of the partsand consequent impairment of the work turned out by the duplicator.However, the narrower sheets are not standard, and therefore not usuallyemployed in very large numbers or for any great length of time, so thatthe duplicator will ordinarily be able to withstand the unbalancedstrains thus introduced for the requisite `limited time. The specicdevice disclosed is a simple and effective one for the purpose.

While I have illustrated and described the preferred form ofconstruction for carrying my invention into eilect, this is capable ofvariation and modification without departing from the spirit. of theinvention. I therefore do not wish to be limited to the precise detailsdisclosed but desire to avail myself of such variations andmodifications as fall within the scope of the appended claims.

I claim as my invention:

1. A duplicator comprising a stencil cylinder; a pair of verticallyswinging arms arranged under said cylinder at the ends thereof; animpression roller carried by said arms and cooperating with saidcylinder; stops on the sides of said arms; substantially verticallypositioned gravity held latches normally engaging said stops to preventelevation of said impression roller into cooperative relationship withsaid cylinder, the upper ends of said latches being set in the path ofthe sides of a paper being fed to said cylinder and roller; and ahorizontally swinging release member arranged to contact with each latchto swing and hold it out of the path of the stop on the correspondingimpression roller arm.

2. A duplicator comprising a stencil cylinder; a pair of verticallyswinging arms arranged under said cylinder at the ends thereof; animpression roller carried by said arms and co-operating with saidcylinder; a tension spring attached to each of said arms and arranged todraw said roller toward operative Contact with said cylinder; means forperiodically lowering said impression roller; stops on the sides of saidarms; substantially vertically positioned gravity held latches normallyengaging said stops to prevent elevation of said impression roller intoco-operative relationship with said cylinder, the upper ends of saidlatches being set in the path of the sides of the paper being fed tosaid cylinder and roller; and a substantially horizontally swingingrelease member arranged to contact with each latch to swing and hold itout of the path of the stop on the corresponding impression roller arm.

3. A duplicator comprising a stencil cylinder; an impression rollerVcooperating therewith; a latch at each end of said impression rollerand located substantially at the plane of the axes of said impressionroller and stencil cylinder and preventing operative contact betweensaid cylinder and roller but automatically releasable by passage of apaper between them; 'and an independently operable release membercooperating with each latch to move and hold it in inoperative position.Y i HENRY H1LDEBRANDT-`

